The invention relates to a floating
water level measurement instrument for
rock engineering investigation, and a measurement method thereof. The floating
water level measurement instrument for
rock engineering investigation comprises support frames, a pullback device, a rocker type winding reel, a measurement
rope, a floating mark and a gravity drag reduction head; the pullback device is connectedbetween the support frames; the upper end of the support frame is installed with the rocker type winding reel through a bearing; the measurement
rope is wound on the rocker type winding reel; the lower end of the measurement
rope is connected with the gravity drag reduction head; the floating mark is put on the gravity drag reduction head; and furthermore, the floating marker sleeves the measurement rope. The floating
water level measurement instrument for
rock engineering investigation, and the measurement method thereof in the invention can solve the following problems: when water
level measurement is carried out, a measurement head can meet with resistance by entering water; therefore, deviation exists between the fall point position and the predetermined position of the measurement head; the error of a measurement value is relatively high due to increasing of the released rope; because the sinking speed of the measurement head is relatively rapid, when the measurement head sinks to the lowest end of a
drill hole, too many released ropes exist due to
continuous rotation of winding reel by
inertia, etc.